@thePheroh For example, you can use your browser's context menu and select "Save video as..." or "Save link as..." (Or something like that... depending on a device/browser you're using) to save a video file to your device.
@thePheroh Are you using a browser instead of a "video player"?
Although browsers can play videos automatically in a browser window, you should complete download process on your device and then open the fully saved file in a "video player" app (Instead of a browser).
@thePheroh No. It seems you are trying to watch while such a video is actually downloading in your browser...
If you download it completely to your device and then open a finished file (via some media player like VLC), it playing fine.
@Angah13621786 Fixed. Please try again.
But there are some difficulties in processing requests for some rare types of URL addresses.
It's better to use "Feedback form" for any bug reports.